<template>
  <view>
    <view class="search_box">
      <uni-search-bar @input="input" :radius="50" cancelButton="none" />
    </view>

    <!-- 搜索建议列表 -->
    <view class="sugg_list" v-if="searchResults.length !== 0">
      <view class="sugg_item" v-for="(item,i) in searchResults" :key="i" @click="goDetail(item)">
        <view class="goods_name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>

    <!-- 搜索历史 -->
    <view class="history_box" v-else>
      <!-- 标题区域 -->
      <view class="history_title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean()"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history_list">
        <uni-tag :text="item" type="" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: null,
        // 搜索的结果列表
        searchResults: [],
        // 搜索历史的数据
        historyList: []
      };
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      input(e) {
        clearTimeout(this.timer)

        this.timer = setTimeout(() => {
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        // 判断关键字是否为空
        if (this.kw.length === 0) {
          this.searchResults = []
          return
        }

        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        
        this.saveSearchHistory()
      },
      goDetail(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory() {
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        
        this.historyList = Array.from(set)
        // 调用 uni.setStorageSync(key,value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw',[])
      },
      // 点击跳转商品列表页面
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search_box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .sugg_list {
    padding: 0 5px;

    .sugg_item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;

      .goods_name {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history_box{
    padding: 0 5px;
    .history_title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history_list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
